Update DNS page with card-based client recommendations (#1900)

* WIP: Add icons

* Add Google Play and App Store links

* Add tentative Android logo

* Update Unbound logo, text cleanup, formatting

* Add banner for anonymized dns, more cleanup

* Some text clarification

* Add "https:" for local development

* Update terms formatting and include anonymized dnscrypt

* Move terms section to bottom of page

* Add LibreDNS

* Update AdGuard hosting provider

* Add forum links

* Reword "terms" to "definitions"

* Add card for Stubby

* Add warning link to Android 9 card

* LibreDNS supports QNAME min

assets/img/svg/3rd-party/android.svg

@@ -0,0 +1,19 @@
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+</g>
+</svg>

assets/img/svg/3rd-party/unbound.svg

@@ -0,0 +1,2 @@
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